Saturday 9:30 Python Homework 11.17.

Question ：

write a program to ask user about the date(year, month and day), then calculate the day of the year.

Sample input：

Year: 2016
Month: 6
Day: 23

Sample output：

Day of the year: 175

Hint:

You need consider leap years and non leap years, in order to do easier calculation, you may create a list to contain all the days in each month:

if it is a leap year, then mo = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], otherwise, mo = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]